1995 Toyota Previa idles too fast when engine is warm

I have a 1995 Previa that has recently been overhauled because of a blown head gasket. I purchased the van with the gasket blown so I have no history on how it ran before the gasket blew. After the overhaul the engine idles fine when cold but idles at about 1200 RPM when hot. I have checked and adjusted valve clearance, and timing. I do not detect any vacuum leaks. I have checked the mechanical idle stop and it is not holding the throttle body valve open. I have also checked the idle control valve and don't think there is anything wrong with it. Engine performs fine, has plenty of power and doesn't rattle when climbing a hill.

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either bad intake gasket ,warped or cracked intake manifold,cracked or warped head,or head gasket blown if u have access to a radiator pressure tester pressurize the system and use a mirror to try and pinpoint the exact location of leak

It could be the thermostat replac eto be sure but also check to make sure the cooling fan is coming on periodically observe engine idling after the motor warms up the fan should come on after 5 - 10 minutes idling if not replace either the fan relay or the coolant fan switch

it would cost somewhere around $1.200- to 2.000 dollars call around to different repair shop and see if you can find a good deal or someone who can do it on the side for you and try this website to see if your car is listed it www.autozone.com or pickup a haynes auto repair manual and you see its not hard to do.

Look the engine over and see if you can find any external leaks, change the thermostat and make sure that fan(s) are operating.Check the oil for water...loosing that much, it has to show up somewhere. Blown headgasket usually puts oil in coolant or coolant in oil, causes an external leak from between head and block or goes out through the tailpipe as steam.look carefully and you will find your problem!!

its normal it just a moisture in your piping which causing to smoke that way...but if the smoke still when normal driving you might check the reservoir for cloudy water instead of coolant in that case you may have a blown head gasket if you got luck but if no cylinder or head are crack..anyways do not worry about white smoke you must worry if you have black smoke

I had a power problem, when cold idled just fine,when warm it would miss at idle, spudder on acceleration and sound just fine at higher rpm. found number three spark plug wire had burned through lower boot. Spark was firing to head at low idle. same wire burn twice with about 40000 mile between.